US10396562B2 - Series compensation device applicable to double-circuit line - Google Patents

Series compensation device applicable to double-circuit line Download PDF

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US10396562B2
US10396562B2 US16/319,300 US201716319300A US10396562B2 US 10396562 B2 US10396562 B2 US 10396562B2 US 201716319300 A US201716319300 A US 201716319300A US 10396562 B2 US10396562 B2 US 10396562B2
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Prior art keywords
compensation device
double
series compensation
circuit lines
series
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US20190157871A1 (en
Inventor
Ruhai HUANG
Yu Lu
Yunlong DONG
Lei Pan
Defeng QIU
Chongxue JIANG
Jiang Lu
Gang Li
Zhaoqing Hu
Nannan Wang
Jiudong DING
Ke Wang
Xianlai HU
Hui Wang
Shunke SUI
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering Co Ltd
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Assigned to NR ENGINEERING CO., LTD, NR ELECTRIC CO., LTD reassignment NR ENGINEERING CO., LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HU, Xianlai, LU, YU, DING, Jiudong, DONG, Yunlong, HU, Zhaoqing, HUANG, Ruhai, JIANG, Chongxue, LI, GANG, LU, JIANG, PAN, LEI, QIU, Defeng, SUI, Shunke, WANG, HUI, WANG, KE, WANG, NANNAN
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
    • H02J3/1814—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/75—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/757—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/7575—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only for high voltage direct transmission link
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Definitions

  • the invention relates to the field of flexible alternating current (AC) transmission, and particularly relates to a series compensation device suitable for double-circuit lines.
  • AC alternating current
  • the equipment for flexible AC transmission system can be divided into series compensation devices, parallel compensation devices and integrated control devices.
  • the parallel compensation devices can be directly connected to various levels of power grids, while series compensation devices and integrated control devices need to be connected to power grids in series at one end, and thereby their connection modes should be studied in comprehensive consideration of reliability, flexibility and security thereof.
  • static synchronous series compensator SSSC
  • UPFC unified power flow controller
  • IPFC inter-line power flow controller
  • CSC convertible static compensator
  • UPQC unified power quality regulator
  • other device includes two converters and the corresponding transformer to perform isolation and transformer functions. Since the static synchronous series compensator is generally performed as an additional operation mode for other devices, it can also be included in the same kind.
  • series end of series compensation devices or integrated control devices is connected to power grids through series transformers.
  • the 110 kV and above power grids in China mostly adopt double-circuit line structure, which requires two series transformers to connect two sets of series compensation devices to double-circuit lines respectively, which inevitably increases area occupation and investment costs, and at the same time, multiple series transformers also increase the overall loss.
  • cost, area occupation and equipment loss will further limit the application of series compensation devices.
  • a series compensation device more suitable for double-circuit lines is needed.
  • the purpose of the present invention is to provide a series compensation device suitable for double-circuit lines, which is designed in comprehensive consideration of cost, volume and equipment loss, and satisfies the economy and reliability of FACTS connected to power grid.
  • a series compensation device for double-circuit lines comprises at least one voltage source converter and one three-phase multi-winding transformer, wherein at least two windings of the three-phase multi-winding transformer are connected in series into the double-circuit lines respectively, and at least one winding is connected to an AC side of the voltage source converter.
  • three phases of the at least one winding of the three-phase multi-winding transformer that is connected to the voltage source converter are star-connected and grounded directly, star-connected and grounded via a resistor, or delta-connected.
  • the three-phase multi-winding transformer when adopts a three-phase integrated structure, it includes a delta-connected balancing winding which operates without load.
  • the connection modes of the converters include but not limited to: AC sides of all the voltage source converters are connected in parallel and then connected to one winding of the transformer; all the voltage source converters are connected to multiple windings of transformer respectively, and each voltage source converter is connected to one corresponding winding of the transformer; all the voltage source converters are divided into several groups, and each group is connected in parallel and then connected to one of multiple windings of the transformer.
  • circuit breakers circuit breakers, isolators, arresters, and bypass devices.
  • the bypass devices are configured in phase-to-phase or line-to-line of AC systems and comprise a breaker, a thyristor valve, or a spark gap.
  • circuit breakers circuit breakers, isolators, arresters, and bypass devices.
  • the series compensation device may be used for multiple-circuit lines, and accordingly the multiple-circuit lines are connected to multiple windings of the transformer by split-phase series connection.
  • the series compensation device can be installed independently in power transmission system, and the series compensation device can be connected to a power transmission line as a part of (but not limited to) a unified power flow controller, a convertible static compensator, a static synchronous series compensator, an inter-line power flow controller or a unified power quality regulator.
  • the present invention comprises only one series transformer and can realize the connection for double-circuit lines through multiple windings.
  • the transformer is divided into two parts: valve side windings and line side windings.
  • the total current of the valve side windings (converted to the line side) is equal to the total current of the line side windings, while in normal operation, the total current of double-circuit lines is always far less than 2*rated current of the line. Therefore, the total current of all converters (converted to the line side) only needs to be selected as the maximum possible operation current of the line current.
  • the current of the converter of each series compensation device (converted to the line side) must be equal to the rated current of the line.
  • the total current of the converter of two series compensation devices is equal to 2*rated current of the line; while using the solution of the present invention, the total current of the converter can be far less than 2*rated current line, that is, under the same rated output voltage, the converter capacity of the present solution is far less than that of conventional solution, which improves the operation efficiency of series compensation device, saves the cost of device, saves the occupied area and equipment cost of the series transformer, and improves economy and reliability for FACTS connected to power grid.
  • FIG. 1 is a schematic diagram of a wiring structure of a series compensation device suitable for double-circuit line in the present invention.
  • FIG. 2 is a schematic diagram of a connection method of a star-connected winding grounded directly at the converter side of a multi-winding transformer in the present invention.
  • FIG. 3 is a schematic diagram of a connection method of a delta-connected winding at the converter side of a multi-winding transformer in the present invention.
  • FIG. 4 is a schematic diagram of a connection method of a multi-winding transformer with a balancing winding in the present invention.
  • FIG. 5 is a schematic diagram of a wiring mode in which multiple converters are connected in the present invention.
  • FIG. 6 is a schematic diagram of a wiring mode extended to a three-circuit line of the present invention.
  • FIG. 7 is a schematic diagram of a wiring structure of the invention as an integral part of a unified power flow controller.
  • the present invention provides a series compensation device suitable for double-circuit lines, which comprises at least one voltage source converter and one three-phase multi-winding transformer, wherein at least two windings of the three-phase multi-winding transformer are connected in series into the double-circuit lines respectively, and at least one winding is connected to an AC side of the voltage source converter.
  • the converter and double-circuit transmission lines are connected with three windings of the multi-winding transformer respectively, which constitute the minimum structure of the device.
  • FIG. 2 and FIG. 3 show respectively schematic diagrams of connection methods of a star-connected winding grounded directly and a delta-connected winding at converter side.
  • the multi-winding transformer when it adopts a three-phase integrated structure, it includes a delta-connected balancing winding which operates without load.
  • FIG. 4 shows a schematic diagram of the multi-winding transformer with a balancing winding.
  • the connection mode of multiple converters includes but not limited to: AC sides of all converters are connected in parallel and then connected to one winding of the transformer; all the converters are connected to multiple windings of transformer respectively, and each converter is connected to one corresponding winding of the transformer; as shown in FIG. 5 , all the converters are divided into several groups, and each group is connected in parallel and then connected to one of multiple windings of the transformer.
  • circuit breakers circuit breakers, isolators, arresters, and bypass devices.
  • the bypass devices are configured in phase-to-phase or line-to-line of the AC systems, and comprise a breaker, a thyristor valve, or a spark gap.
  • circuit breakers circuit breakers, knife gates, lightning arresters, bypass devices and some or all devices.
  • the series compensation device may be used for multiple-circuit lines, and accordingly, the multiple-circuit lines are connected to multiple windings of the transformer by split-phase series connection.
  • the multiple-circuit lines are connected to three windings of the transformer at the line side by split-phase series connection, respectively, and two converters are connected in parallel and then connected to one winding of the transformer.
  • the series compensation device can be installed independently in a power transmission system, and the series compensation device can be connected to a power transmission line as a part of (but not limited to) a unified power flow controller, a convertible static compensator, a static synchronous series compensator, an inter-line power flow controller or a unified power quality regulator.
  • FIG. 7 shows a usage as part of the unified power flow controller.
  • the present invention comprises only one series transformer and can realize the connection for double-circuit lines through multiple windings.
  • the transformer is divided into two parts: valve side windings and line side windings.
  • the total current of the valve side windings (converted to the line side) is equal to the total current of the line side windings, while in normal operation, the total current of double-circuit lines is always far less than 2*rated current of the line. Therefore, the total current of all converters (converted to the line side) only needs to be selected as the maximum possible operation current of the line current.
  • the current of the converter of each series compensation device (converted to the line side) must be equal to the rated current of the line.
  • the total current of the converter of two series compensation devices is equal to 2*rated current of the line; while using the solution of the present invention, the total current of the converter can be far less than 2*rated current line, that is, under the same rated output voltage, the converter capacity of the present solution is far less than that of conventional solution, which improves the operation efficiency of series compensation device, saves the cost of device, saves the occupied area and equipment cost of the series transformer, and improves economy and reliability for FACTS connected to power grid.

Abstract

A series compensation device suitable to double-circuit lines is disclosed. The device includes one series transformer and one converter. One converter and dual-circuit transmission lines are respectively connected to three windings of one series transformer. In the solution provided in the present application, the device can be independently installed in a power transmission system to be used as a static synchronous series compensator, and can also be used as a component of a unified power flow controller, a convertible static compensator, an interline power flow controller and a unified power quality conditioner to be connected to a power transmission system device in series. The device can save the capacity of a converter, improve the application efficiency of the series compensation device, and reduce the cost and area occupation.

Description

RELATED APPLICATIONS
This application is the U.S. National Phase of and claims priority to International Patent Application No. PCT/CN2017/097478, International Filing Date Aug. 15, 2017, entitled Series Compensation Device Applicable To Double-Circuit Line; which claims benefit of Chinese Patent Application No. 201610677937.1 filed Aug. 16, 2016; both of which are incorporated herein by reference in their entireties.
FIELD OF THE INVENTION
The invention relates to the field of flexible alternating current (AC) transmission, and particularly relates to a series compensation device suitable for double-circuit lines.
BACKGROUND OF THE INVENTION
The equipment for flexible AC transmission system (FACTS) can be divided into series compensation devices, parallel compensation devices and integrated control devices. The parallel compensation devices can be directly connected to various levels of power grids, while series compensation devices and integrated control devices need to be connected to power grids in series at one end, and thereby their connection modes should be studied in comprehensive consideration of reliability, flexibility and security thereof.
In series compensation devices and integrated control devices, static synchronous series compensator (SSSC), unified power flow controller (UPFC), inter-line power flow controller (IPFC) and convertible static compensator (CSC) are all flexible power transmission devices that can improve the transmission and control capabilities of the system; there is also a unified power quality regulator (UPQC), which can improve the power quality of lines. In addition to the static synchronous series compensator, other device includes two converters and the corresponding transformer to perform isolation and transformer functions. Since the static synchronous series compensator is generally performed as an additional operation mode for other devices, it can also be included in the same kind.
At present, the series end of series compensation devices or integrated control devices is connected to power grids through series transformers. The 110 kV and above power grids in China mostly adopt double-circuit line structure, which requires two series transformers to connect two sets of series compensation devices to double-circuit lines respectively, which inevitably increases area occupation and investment costs, and at the same time, multiple series transformers also increase the overall loss. For power grids with more circuit structures, cost, area occupation and equipment loss will further limit the application of series compensation devices. In order to solve the above shortcomings and improve the economy of FACTS access to power grid, a series compensation device more suitable for double-circuit lines is needed.
SUMMARY OF THE INVENTION
The purpose of the present invention is to provide a series compensation device suitable for double-circuit lines, which is designed in comprehensive consideration of cost, volume and equipment loss, and satisfies the economy and reliability of FACTS connected to power grid.
In order to achieve the above purposes, the solution of the present invention is described as below:
A series compensation device for double-circuit lines comprises at least one voltage source converter and one three-phase multi-winding transformer, wherein at least two windings of the three-phase multi-winding transformer are connected in series into the double-circuit lines respectively, and at least one winding is connected to an AC side of the voltage source converter.
According to the series compensation device suitable for double-circuit lines, three phases of the at least one winding of the three-phase multi-winding transformer that is connected to the voltage source converter are star-connected and grounded directly, star-connected and grounded via a resistor, or delta-connected.
According to the series compensation device suitable for double-circuit lines, when the three-phase multi-winding transformer adopts a three-phase integrated structure, it includes a delta-connected balancing winding which operates without load.
According to the series compensation device for double-circuit lines, when there are a plurality of voltage source converters, the connection modes of the converters include but not limited to: AC sides of all the voltage source converters are connected in parallel and then connected to one winding of the transformer; all the voltage source converters are connected to multiple windings of transformer respectively, and each voltage source converter is connected to one corresponding winding of the transformer; all the voltage source converters are divided into several groups, and each group is connected in parallel and then connected to one of multiple windings of the transformer.
According to the series compensation device for double-circuit lines, some or all of following devices are arranged between the voltage source converter and the transformer, including but not limited to: circuit breakers, isolators, arresters, and bypass devices.
According to the series compensation device for double-circuit lines, the bypass devices are configured in phase-to-phase or line-to-line of AC systems and comprise a breaker, a thyristor valve, or a spark gap.
According to the series compensation device for double-circuit lines, some or all of following devices are arranged between the multi-winding transformer and power transmission lines, including but not limited to: circuit breakers, isolators, arresters, and bypass devices.
According to the series compensation device for double-circuit lines, the series compensation device may be used for multiple-circuit lines, and accordingly the multiple-circuit lines are connected to multiple windings of the transformer by split-phase series connection.
According to the series compensation device for double-circuit lines, the series compensation device can be installed independently in power transmission system, and the series compensation device can be connected to a power transmission line as a part of (but not limited to) a unified power flow controller, a convertible static compensator, a static synchronous series compensator, an inter-line power flow controller or a unified power quality regulator.
By using the above-mentioned solution, the present invention comprises only one series transformer and can realize the connection for double-circuit lines through multiple windings. The transformer is divided into two parts: valve side windings and line side windings. In normal operation, the total current of the valve side windings (converted to the line side) is equal to the total current of the line side windings, while in normal operation, the total current of double-circuit lines is always far less than 2*rated current of the line. Therefore, the total current of all converters (converted to the line side) only needs to be selected as the maximum possible operation current of the line current. If a series compensation device is used for each circuit line, the current of the converter of each series compensation device (converted to the line side) must be equal to the rated current of the line. For double-circuit lines, the total current of the converter of two series compensation devices is equal to 2*rated current of the line; while using the solution of the present invention, the total current of the converter can be far less than 2*rated current line, that is, under the same rated output voltage, the converter capacity of the present solution is far less than that of conventional solution, which improves the operation efficiency of series compensation device, saves the cost of device, saves the occupied area and equipment cost of the series transformer, and improves economy and reliability for FACTS connected to power grid.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic diagram of a wiring structure of a series compensation device suitable for double-circuit line in the present invention.
FIG. 2 is a schematic diagram of a connection method of a star-connected winding grounded directly at the converter side of a multi-winding transformer in the present invention.
FIG. 3 is a schematic diagram of a connection method of a delta-connected winding at the converter side of a multi-winding transformer in the present invention.
FIG. 4 is a schematic diagram of a connection method of a multi-winding transformer with a balancing winding in the present invention.
FIG. 5 is a schematic diagram of a wiring mode in which multiple converters are connected in the present invention.
FIG. 6 is a schematic diagram of a wiring mode extended to a three-circuit line of the present invention.
FIG. 7 is a schematic diagram of a wiring structure of the invention as an integral part of a unified power flow controller.
 DETAILED DESCRIPTION OF THE EMBODIMENTS
The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.
The present invention provides a series compensation device suitable for double-circuit lines, which comprises at least one voltage source converter and one three-phase multi-winding transformer, wherein at least two windings of the three-phase multi-winding transformer are connected in series into the double-circuit lines respectively, and at least one winding is connected to an AC side of the voltage source converter. As shown in FIG. 1, the converter and double-circuit transmission lines are connected with three windings of the multi-winding transformer respectively, which constitute the minimum structure of the device.
According to the above-mentioned series compensation device suitable for double-circuit lines, three phases of the at least one winding of the three-phase multi-winding transformer that is connected to the voltage source converter are star-connected and grounded directly, star-connected and grounded via a resistor, or delta-connected. FIG. 2 and FIG. 3 show respectively schematic diagrams of connection methods of a star-connected winding grounded directly and a delta-connected winding at converter side.
According to the above-mentioned series compensation device suitable for double-circuit lines, when the multi-winding transformer adopts a three-phase integrated structure, it includes a delta-connected balancing winding which operates without load. FIG. 4 shows a schematic diagram of the multi-winding transformer with a balancing winding.
According to the above-mentioned series compensation device suitable for double-circuit lines, when there are a plurality of voltage source converters, the connection mode of multiple converters includes but not limited to: AC sides of all converters are connected in parallel and then connected to one winding of the transformer; all the converters are connected to multiple windings of transformer respectively, and each converter is connected to one corresponding winding of the transformer; as shown in FIG. 5, all the converters are divided into several groups, and each group is connected in parallel and then connected to one of multiple windings of the transformer.
According to the above-mentioned series compensation device suitable for double-circuit lines, there are but not limited to some or all of following devices arranged between converters and transformers: circuit breakers, isolators, arresters, and bypass devices.
According to the above-mentioned series compensation device suitable for double-circuit lines, the bypass devices are configured in phase-to-phase or line-to-line of the AC systems, and comprise a breaker, a thyristor valve, or a spark gap.
According to the above-mentioned series compensation device suitable for double-circuit lines, there are but not limited to some or all of following devices arranged between the multi-winding transformer and power transmission lines: circuit breakers, knife gates, lightning arresters, bypass devices and some or all devices.
According to the above-mentioned series compensation device suitable for double-circuit lines, the series compensation device may be used for multiple-circuit lines, and accordingly, the multiple-circuit lines are connected to multiple windings of the transformer by split-phase series connection. As shown in FIG. 6, three-circuit lines are connected to three windings of the transformer at the line side by split-phase series connection, respectively, and two converters are connected in parallel and then connected to one winding of the transformer.
According to the above-mentioned series compensation device suitable for double-circuit lines, the series compensation device can be installed independently in a power transmission system, and the series compensation device can be connected to a power transmission line as a part of (but not limited to) a unified power flow controller, a convertible static compensator, a static synchronous series compensator, an inter-line power flow controller or a unified power quality regulator. FIG. 7 shows a usage as part of the unified power flow controller.
By using the above-mentioned solution, the present invention comprises only one series transformer and can realize the connection for double-circuit lines through multiple windings. The transformer is divided into two parts: valve side windings and line side windings. In normal operation, the total current of the valve side windings (converted to the line side) is equal to the total current of the line side windings, while in normal operation, the total current of double-circuit lines is always far less than 2*rated current of the line. Therefore, the total current of all converters (converted to the line side) only needs to be selected as the maximum possible operation current of the line current. If a series compensation device is used for each circuit line, the current of the converter of each series compensation device (converted to the line side) must be equal to the rated current of the line. For double-circuit lines, the total current of the converter of two series compensation devices is equal to 2*rated current of the line; while using the solution of the present invention, the total current of the converter can be far less than 2*rated current line, that is, under the same rated output voltage, the converter capacity of the present solution is far less than that of conventional solution, which improves the operation efficiency of series compensation device, saves the cost of device, saves the occupied area and equipment cost of the series transformer, and improves economy and reliability for FACTS connected to power grid.
The technical solutions of the present invention have been described with reference to the above embodiments, which are merely illustrative of the technical scope of the present invention. It should be understood by those skilled in the art that any modification or equivalent replacement can be made to the specific embodiments of the invention by those skilled in the art, these modification or equivalent replacement also fall within the scope of the claims of the invention.

Claims (9)

The invention claimed is:
1. A series compensation device for double-circuit lines, characterized in that: the device comprises at least one voltage source converter and one three-phase multi-winding transformer, wherein at least two windings of the three-phase multi-winding transformer are connected in series into the double-circuit lines respectively, and at least one winding of the three-phase multi-winding transformer is connected to an AC side of the voltage source converter.
2. The series compensation device for double-circuit lines according to claim 1, characterized in that: three phases of the at least one winding of the three-phase multi-winding transformer that is connected to the voltage source converter are star-connected and grounded directly, star-connected and grounded via a resistor, or delta-connected.
3. The series compensation device for double-circuit lines according to claim 1, characterized in that: when the three-phase multi-winding transformer adopts a three-phase integrated structure, the three-phase multi-winding transformer comprises a delta-connected balancing winding which operates without load.
4. The series compensation device for double-circuit lines according to claim 1, characterized in that: when there are a plurality of voltage source converters, connection modes of the voltage source converters include: AC sides of all the voltage source converters are connected in parallel, and then connected to one winding of the three-phase multi-winding transformer; all the voltage source converters are connected to multiple windings of the three-phase multi-winding transformer respectively, and each voltage source converter is connected to one corresponding winding of the three-phase multi-winding transformer; all the voltage source converters are divided into several groups, and each group is connected in parallel and then connected to one of multiple windings of the three-phase multi-winding transformer.
5. The series compensation device for double-circuit lines according to claim 1, characterized in that: some or all of following devices are arranged between the voltage source converter and the three-phase multi-winding transformer: circuit breakers, isolators, arresters, and bypass devices.
6. The series compensation device for double-circuit lines according to claim 5, characterized in that: the bypass devices are configured in phase-to-phase or line-to-line of AC systems, and comprise a breaker, a thyristor valve or a spark gap.
7. The series compensation device for double-circuit lines according to claim 1, characterized in that: some or all of following devices are arranged between the three-phase multi-winding transformer and power transmission lines: circuit breakers, isolators, arresters, and bypass devices.
8. The series compensation device for double-circuit lines according to claim 1, characterized in that: when the series compensation device is used for multiple-circuit lines, the multiple-circuit lines are connected to multiple windings of the three-phase multi-winding transformer by split-phase series connection.
9. The series compensation device for double-circuit lines according to claim 1, characterized in that: the series compensation device can be installed independently in a power transmission system, and the series compensation device can be connected to a power transmission line as a part of a unified power flow controller, a convertible static compensator, a static synchronous series compensator, an inter-line power flow controller, or a unified power quality regulator.
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CN106816881B (en) * 2017-01-16 2020-09-04 全球能源互联网研究院有限公司 Series compensation device and capacity optimization method thereof
CN109256777B (en) * 2018-09-20 2021-05-14 东南大学 IPFC topology suitable for parallel double-circuit line power flow control and steady-state modeling method thereof

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